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    • 8. 发明授权
    • Phase controlled dimming system with active filter for preventing flickering and undesired intensity changes
    • 具有有源滤波器的相控调光系统,用于防止闪烁和不期望的强度变化
    • US06380692B1
    • 2002-04-30
    • US09664232
    • 2000-09-18
    • Robert C. Newman, Jr.Donald F. HausmanRobin C. Moseley
    • Robert C. Newman, Jr.Donald F. HausmanRobin C. Moseley
    • G05F100
    • H02M5/2573H05B39/08Y10S315/04
    • A phase controlled dimming system having an active filter for receiving the AC line voltage waveform, and for recovering the AC fundamental waveform therefrom is disclosed. The recovered AC fundamental waveform is supplied to a zero crossing detector that provides zero crossing indications of the AC fundamental waveform. The recovered AC fundamental is substantially free of noise or distortion, and of frequency components greater than at least second order harmonics, that may be present on the AC line voltage waveform, and that might otherwise result in faulty or incorrect zero crossing detection. An output of the zero crossing detector is supplied to a microprocessor that controls the gating of a controllably conductive device interposed between the controlled load and the AC source based on the zero crossing information. The filter may take an analog or digital (software) form.
    • 公开了一种具有用于接收AC线电压波形的有源滤波器和用于从其中恢复AC基波的相控调光系统。 恢复的AC基波提供给提供交流基波的零交叉指示的过零检测器。 恢复的AC基波基本上没有噪声或失真,以及大于至少二次谐波的频率分量,其可能存在于AC线电压波形上,否则可能导致错误或不正确的过零检测。 零交叉检测器的输出被提供给微处理器,微处理器基于过零信息来控制插入在受控负载和AC源之间的可控导电装置的门控。 滤波器可以采用模拟或数字(软件)形式。